Carburetor



Oct. 6, 1931. F. GIBSON CARBURETOR Filed April 13, 1929 gwuemtcw ww g W 72:2

, Patented et; 6, 1933 stars 8%BJGE FRANCIS GIBSOIL'O]? LUI'DN, ENG-LAND, ASSIGNbB '10 GENERAL HOTOBS COB- POBATION, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE cnnmmmon.

Application filed April 13,

diluted with additional air to form an ex 'plosive mixture for delivery to the engine. lln such carburetors as hitherto made the inertia of the li uid fuel and its relative're-a 1Q moteness' from t e point where'the emulsion enters the choke tube tends to cause a momentary wealrening of the mixture deliveredto the engine when the throttle is suddenly opened. As a result popping back-is apt to 35 occur and the object of the presentv invention is to provide an improved carburetor of the type in question which is not open to these disadvantages.

To thisend according to the present in- 2Q vention a small fuel reservoir or well is providedin close proximity to the oint where the emulsion enters the choke tu e, this well being so placed that it will accumulate fuel under substantially steady throttle condi- 25 tions, but when the throttle is suddenly opened, the fuel it contains will be drawn ofi' into the choke tube so as momentarily 'to enrich the mixture, which normally is weakened as above described. Hence the mixture delivered to the engine is more consistent whatever the throttle conditions might In the accompan ing drawings illustrating one embodiment o the invention:

Fig. 1 is a view in vertical section showing a carburetor with my improvement applied thereto, and

Fig. 2 is a of Fig. 1. p 7

Referring to the drawings, 5 indicates a mixture conduit or mixing chamber adapted to be connected to the intake conduitor manifold of an internal combustion engine, not shown. Within the mixture passage is mounted a throttle valve 6 of any usual type arranged to control flow through the passage under the influence of suction.

Anterior to the throttle valve is a Venturi or choke tube 7 within which is positioned a as nozzle 8, The nozzle is of a form suitable to horizontal sect-ion on line 2-2 -zle by/any usual or suitable structure one 1929. Serial No. 354,941. I

deliver to the choke tube a rich primary mixture or emulsion of fueland air to mingle with the additional air supplied through the lower end of the choke tube which communicates withthe atmosphere. To this end'the upper endofthe nozzle is formed with a conical portion perforated, as at 9, to permit discharge of the right mixture or emulsion.

This emulsion may be supplied to the nozconventional form of which, as illustrated in the drawings, comprises aconstant-level fuel reservoir 10 and a diffuser chamber or well 11. Liquid fuel is supplied to the well ordinarily through a main jet 12 and air may enter through the passage 13. A difi'user tube 14, having perforations 15, is positioned within the ,well 11. Air supplied through passage 13 flows through perforations 15 and, contacting with the fuel in the tube, forms there- -with the emulsion or rich mixture which is conveyed thence, through the passage 16, to nozzle 8. Additional means isshown, comprising tube 17 and passage 18 for supplying rich mixture to a point adjacent to the throttle 6 for idling or closed throttleoperation of the engine. I

In accordance with the present invention 1 provide, in the immediate vicinity of the nozzle 8, as, for example, immediately below the nozzle, a well or chamber 20 which may be formed by'merely extending the nozzle tube below the level of the passage 16 and closing the lower end, as by a plug 21. This chamber or well should be so positioned that during substantially steady throttle positions, particularly when the throttle is only partly open, liquid will be deposited in the well from the emulsion flowing through the passage 16 and to the nozzle openings 9.

.T he well 20 should also be so positioned or formed thatupon a sudden increase of suction at the nozzle, as, upon sudden opening of the throttle, the liquid in the well will be discharged through the nozzle openings thus providing for the desirable additional supply of fuel for acceleration. To assist in such discharge 1 have provided an additional conduit 22 connecting the base of nozzle 8 or lower portion of well 20 with a more remote 100 pgint, as to a more distant portion of passage 1 response to sudden throttle openings is ensured.

It is to be understood that the construction described above is given'by way of example only and that constructional details may be varied within wide limits without departing from this invention.

I claim:

1. In a carburetor having a main mixing passage with an air inlet, a mixture outlet and a throttle valve in the mixture outlet; meansfor forming an emulsion of fuel and a small quantity of air; means for discharging said emulsion into the main mixing passage,

and means connected with said discharging means for collecting liquid fuel from the passing stream of emulsion and discharging the collected fuel as an accelerating charge upon a sudden opening of the throttle valve.

2. In a carburetor having a mixing passage with an air inlet, a mixture outlet and a throttle valve in the mixture outlet; means for forming an emulsion of fuel and a small quantity of air; emulsion discharging means in the mixing passage; a passe e connecting the emulsion forming means an the emulsion discharging means; a pocket in the emulsion discharging means extending belowthe level of said passage and adapted to collect liquid fuel from the passing stream of emulsion, and a second passage leading from a point in the emulsion passage anterior to its connection with said discharging means to the lower. part of said pocket, so that accumulated t'ucl is discharged from said pocket upon a sudden 1 opening of the throttle, to serve as an accelerating charge.

3. A carburetor comprising a mixture conduit having a throttle valve therein, a nozzle in said conduit anterior to said valve, a passage leading to said nozzle, means for supplying to said passage a rich mixture of fuel and air, a sump adjacent to the nozzle positioned to collect liquid fuel from said emulsion and a passage leading to the lower part of the sump to permit discharge of liquid therefrom to the nozzle under the influence of a sudden increase of suction at the nozzle.

4. A carburetor comprising a mixture conduit having a Venturi passage therein and a throttle valve above said Venturi passage, a nozzle positioned to discharge into said Venturi passage, means for mixing air and 

